Everytime you have some leftover good bread, slice and lightly toast the leftovers in your toaster, oven or toaster oven. Real cooks recommend removing the crusts; I don't bother. (Honestly, I don't even toast it first. I just grind up the old bread.)
Pulse in food processor until the bread becomes crumbs. I store them in a ziploc bag in my freezer. These have many uses: you can saute them in a pan with a little oil and add any seasonings of your choice such as garlic, herbs, or a bit of grated cheese. Use them to top roasted vegetables (broccoli, asparagus), sauteed greens in garlic, gratins, or pasta dishes (especially good when made with garlic and parmesan and used to top pasta with pesto). You can also use them for coating meat or fish for sauteing or frying.
Being a midwestern cheapskate I had stored up bags of these in the freezer and they were driving my husband crazy. Once we knew we were moving this summer I started trying to use everything up and started putting bread crumbs on everything and now we are out! They taste great and the little bit of crunchy texture is a great complement to so many dishes.